Pull-switch for electric mine-signals.



C. CLAUSEN. PULL SWITCH FOR ELECTRIC MINE SIGNALS.

APPLICATION FILED APR. I9. i916- Patented Feb. 2?, 1917.

of Bisbee, in the county 'of Cochise .and-

e use in mine signals whereby a signal `from UNITED sTATEs PATENT OFFICE.

CARL CLAUSEN, oFBrsi-a'nn, ARIZONA;

PULL-SWITCH Fon ELECTRIC MINE-sIGNALs.

Specication'of Letters Patent.

Patented Feb. 27, l1917.

Application led April 19, 1916. Serial No. 92,171.

To all 'whom it may concern.'

Be it known that I, CARL CLAUSEN, a citizen of the United States, anda resident State of Arizona, havel invented a new and Improved Pull-Switch for l,Electric Mine- Signals, of which the following is a full, clear, and exact description.

lThis invention relates toV electric switches, a-nd more particularly toa pull switch for a lower level can be transmitted to the engineers station, although the invention is not necessarily limited to this particula use.

The invention has for its general objects to improve and simplify the construction and operation of pull switches so as to be reliable and elicient in use, comparatively' inexpensive .to manufacture, and so designed that it willpositively ,automatically larity in the following description and claims appended hereto.

In the accom anying drawing which illustrates one em odiment of theinvention and wherein similarcharacters of reference indicate corresponding parts in all the views,

Figure 1 is a vertical longitudinal section of the switch on the line 1 1, Fig. 2;

Fig. 2 is a side view with' the casing or houslng in section; and

Fig. 3 is a horizontal section onv the line 3-3, Fig. 1.

Referring to the drawing, 1 designates a suitably shaped housing dpr' vided with.l

apertured ears 2,.Whereby the housingcan be fastened to a support. The housing is closed at all points, except the bottom,

which is provided with a threadedvl opening y.3

into which is screwedv a plu 4. Extending through the plug is a vertica movable rod Tf'slidable in a guide 6 which is -a pipe nipple. This nipple is screwed into the plug 4 and is disposed in the housing 1. Surrounding. the nipple is a ring 7 of insulation clamped in place against the plug 4 by a locking plate 8 and a nut 9. Fastened to opposite -sides of this block 7 of insulation are upwardly extendingmetallic ,springs '1'0 and 11, and the upper ends of these springs Vare bent inwardlyand downwardly to form yielding contacts 1-2y and '13 which are spaced apart at opposite sides of the upper end vof the rod' 5. This rod 5 carries an annular bridging contact 14which is adapted to engage the contacts 12-and 13. The contact 14 in insulated from its carrying rod 5 by a sleeve of insulation 15 and is 'clamped in place between rings of insula? 'i tion 16 and 17 which are in turn held in place by nuts 18 and 19 threaded on the rod z.

v5. The relatively stationary ncontacts are connected respectively withcircuit wiresA 20 and 20 which pass in through openings in the plug and are connected `respectively withl the contacts 10 and 11. The switch is normally open, with the bridging contact 14 disengaged from the contact springs.

spring 21 encircles the lower end Aof the rod -4 5 and operates upwardly `on the same to hold the switch'open. vThe spring-has its upper end bearing on an abutment in the form of a ring 22 which surrounds the rod 5 and is adjustably held in place by nuts 23` Y f screwed on the rod. These nuts form a shoulder engageable with the plug 4 to limit the upward'movement of the rod, and by adjusting the nuts the tension of rthe spring` 21 can be varied. The lower end of the spring bears against an abutment 24 which 25 screwed on the lower end of a pipe nipple 26vthat is in turn screwed into the plug 4. On thenlower end 'of the'rod 5 is a loop or equivalent device 27 for enabling a chain, cable 'or its equivalent to be fastened to the movable element of the switch, whereby thel latter can be con trclled from a remote point. downwardly on the rod 5 the switch C`on tacts can be engaged for closing the signal circuit and by a pre-.arranged code signals may be transmitted by the frequency or duration ofthe closings and openings of the circuit throug the engagements and disengagements o he contacts 12, 13, and

14. It will be observed that t e varius parts of. the switch, together 4w th its op` By pulling l gether with the device which I now consider to be the best embodimentvthereof, I desire to have it understood that the device shown is mrely illustrative and that such changes may be' made when desired as fall within thescope of the appended claims.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

l. A switch comprising ahousing having an opening, a plu inserted in the opening,'

a rod extending t rough the plug, a tubular member fastened to the plug and disposed within the housing, a ring of insulation surrounding the tubular member, a nut screwed on the tubular member for clamping the insulation to the plug, contacts fastened to and insulated from each other by the insulation ring, a bridging contact fastened to and insulated from the rod and adapted to engage the rst-mentioned contacts, a4 sprlng on the rod normally operating to hold the. bridging contact separated romthe first-mentioned contacts, a housing disposed outside the first housing inclosing the spring and rod, and means connected withy the rod for ,moving the same against the tension of the spring to close the circuit through the switch.

2. A switch of the class described comprising a housing, a longitudinally movable rod extending into the housing, a contact carried by and insulated from the inner end of the rod, spring contacts mounted in the housing and insulated from it and from each other and arranged to be engaged by the prising a housing having a threaded opening, a plugscrewed into the opening, a tubular member screwed into the plug, an insulation ring surrounding the tubular member, means on the tubular member for clamping the ring in place, contacts fastened to the ring and insulated from each other, a rod extending through the plug and tubular member, a contact carried by and insulated from the rod and arranged to engage the first-mentioned contacts, a tubular element having a threaded connection with the plug and disposed outside the housing and surrounding the portion of the rod disposed exterior to the housing, a spring surrounding the rod and disposed within the tubularl element, a cap screwed on the tubular element and having an abutment for one end of the spring, an abutment on the rod for theopposite end of the spring, a nut onl the rod for adjusting the position of the lastmentioned abutment to vary the tension of the spring and also forming a stop for limiting the movement of the rod in one direction, and means for permitting an actuator to be attached to the rod.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

CARL CLASEN.

L. C. SHATTUGK, ERNEST J. Bam. 

